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Benchmarking for Merge Operator

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Summary:
Updated db_bench and utilities/merge_operators.h to allow for dynamic benchmarking
of merge operators in db_bench. Added a new test (--benchmarks=mergerandom), which performs
a bunch of random Merge() operations over random keys. Also added a "--merge_operator=" flag
so that the tester can easily benchmark different merge operators. Currently supports
the PutOperator and UInt64Add operator. Support for stringappend or list append may come later.

Test Plan:
	1. make db_bench
	2. Test the PutOperator (simulating Put) as follows:
./db_bench --benchmarks=fillrandom,readrandom,updaterandom,readrandom,mergerandom,readrandom --merge_operator=put
--threads=2

3. Test the UInt64AddOperator (simulating numeric addition) similarly:
./db_bench --value_size=8 --benchmarks=fillrandom,readrandom,updaterandom,readrandom,mergerandom,readrandom
--merge_operator=uint64add --threads=2

Reviewers: haobo, dhruba, zshao, MarkCallaghan

Reviewed By: haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D11535
This commit is contained in:
Deon Nicholas
2013-08-15 17:13:07 -07:00
parent f3dea8c13c
commit ad48c3c262
6 changed files with 213 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
utilities/merge_operators/string_append/stringappend2.cc
View File

@@ -66,25 +66,38 @@ bool StringAppendTESTOperator::PartialMerge(const Slice& key,
std::string* new_value,
Logger* logger) const {
return false;
}
// // Clear the *new_value for writing.
// assert(new_value);
// new_value->clear();
//
// // Generic append
// // Reserve correct size for *new_value, and apply concatenation.
// new_value->reserve(left_operand.size() + 1 + right_operand.size());
// new_value->assign(left_operand.data(), left_operand.size());
// new_value->append(1,delim_);
// new_value->append(right_operand.data(), right_operand.size());
//
// return true;
// A version of PartialMerge that actually performs "partial merging".
// Use this to simulate the exact behaviour of the StringAppendOperator.
bool StringAppendTESTOperator::_AssocPartialMerge(const Slice& key,
const Slice& left_operand,
const Slice& right_operand,
std::string* new_value,
Logger* logger) const {
// Clear the *new_value for writing.
assert(new_value);
new_value->clear();
// Generic append
// Reserve correct size for *new_value, and apply concatenation.
new_value->reserve(left_operand.size() + 1 + right_operand.size());
new_value->assign(left_operand.data(), left_operand.size());
new_value->append(1,delim_);
new_value->append(right_operand.data(), right_operand.size());
return true;
}
const char* StringAppendTESTOperator::Name() const {
return "StringAppendTESTOperator";
}
std::shared_ptr<MergeOperator>
MergeOperators::CreateStringAppendTESTOperator() {
return std::make_shared<StringAppendTESTOperator>(',');
}
} // namespace leveldb